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Please help the volunteers to help you by supplying the version of phpList you are using, browser & version and if possible, a link to your phpList installation. This is for Version 2 of phpList (the orange one).

I moved my client and her phpList to a new server in September. She did a couple of successful mailouts but recently keeps getting "504 Gateway Time-out". I enquired with the webhost and they cited "limitation to the resources of shared hosting packages". We're only talking 320 members. Is that fair enough? Should we be moving elsewhere?

See if you can find out what limits the host are talking about, it should be somewhere in the host's FAQs...

The trouble is, the "resources of shared hosting packages" are shared over a number of customers, like yourself and they may be quite limited. It may well be worth your moving hosts to one that doesn't have such tight limits.